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Mydriasis is the medical term for dilation of the pupils of the eyes. It is a normal physiological response to changes in light levels, but can also be induced by a variety of medications, substances, or medical conditions.
Some medications that can cause mydriasis include certain types of eye drops, such as those used to dilate the pupils during eye exams, as well as some medications used to treat conditions such as asthma, migraine headaches, or motion sickness. Substances such as cocaine, amphetamines, and other stimulants can also cause mydriasis.
Medical conditions that can cause mydriasis include head injuries, brain tumors, and certain neurological disorders such as third nerve palsy or Horner's syndrome. In some cases, mydriasis may be a symptom of a more serious underlying condition, such as a stroke or a brain hemorrhage.
If mydriasis is persistent or accompanied by other symptoms such as headache, dizziness, or blurred vision, it is important to seek medical attention to rule out any underlying medical conditions. Treatment for mydriasis depends on the underlying cause, and may include medications, surgery, or other interventions.